VERIFY OPERATION
When installing an analyzer (or unexpected or unusual analysis results are obtained) the operation
of the analyzer should be verified.
1. Perform a calibration run.
2. Perform an analysis without a sample following the instructions for performing a sample run.
a. Enter zero for sample weight and density, or enter zero volume for the sample.
b. When prompted to place the sample in the chamber, remove the chamber/plunger
assembly from the analyzer, but DO NOT remove the plunger.
c. Shake the chamber/plunger assembly to eliminate any compaction of the Dry Flo, then
replace it on the analyzer.
d. The reported envelope volume for the sample should be near zero if the instrument is per-
forming correctly.
3. Perform a sample run using the same object(s) used in the calibration run. During the sample
run, use the calibrated conversion factor resulting from the calibration run. The sample run res-
ults should be within a percent of the values ascribed to the sample material during the cal-
ibration run.
Use this method to check for correct interpolation within stored blank data. Use a quant-
ity of Dry Flo within the range stored in the set. If the resulting volume is not close to
zero, the first possible cause to evaluate is the weighing accuracy and repeatability.
Unless precise weights are obtained, the stored blank test procedure can give mis-
leading results.
IF ANALYSIS ERRORS OCCUR
1. Ensure the Dry Flo is flowing freely and not contaminated. It is recommended to change to
fresh Dry Flo.
2. Evaluate the accuracy of the technique. Ensure Dry Flo is not lost due to splashing or spilling
when the sample/calibration object is introduced into the chamber. If using stored blank data,
use an extremely accurate method for weighing the Dry Flo. (Weights must be accurate to
within a few milligrams.)
3. Evaluate the accuracy of the analytical balance using manufacturer’s instructions.
4. Consider whether the chamber/plunger assembly may have become loosened from the ana-
lyzer during analysis. If the chamber and plunger to each mandrel are not secure, data may be
inaccurate.
5. Calibrate the force transducer. Also check correct interpolation within stored blank data using
this method.
6. Ensure sufficient quantity of Dry Flo within the range stored in the set. If the resulting volume is
not close to zero, the first possible cause to evaluate is weighing accuracy and repeatability.
Unless precise weights are obtained, the stored blank test procedure can give misleading res-
ults.
Verify Operation
GeoPyc 1365 Operator Manual
136-42800-01 (Rev -) — Dec 2016
2 - 11
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